parker



N E-Di S AT PA ENT- OFFICE,

WILL BYRNS, or

HUOKLEBERRY, or SAME PLACE.

"TELEPHONE... g

srncmcerror: forming W of Letters Patent No. 617,314, dated. January '10, 1899.

Application filed Hay 27,1d97.

To wllwhom it may concern: Be itkn'own that I, WILL 'Adams, in the county of Decatur and State of Indiana, have invented certain new and ,5 useful Improvementsin Telephones and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others'skilled inthe art to which it appertainsf to make and use the same.

' My invention relates to magneto-telephones, and is designed for the production of an ini- .proved transmitter by. means of which articulate sounds may be transmitted with a 'over the line-wire to the receiver.

The invention consists in certain details of construction and combinations of parts,which will be hereinafter more fully described and claimed. v In the drawings forming a part of this specification, Figure 1 represents a vertical longitudinal sectional view through the transmitter. Fig. 2 is a similar view at right angles thereto.

Like reference-numerals indicate like parts in both views. e j

The casing or cabinet 1 is provided with an opening,in which the mouthpiece 2 is located. Within the casing is secured a hollow softiron core 3, having heads4 5 at oppositeends thereof, the head-5, adjacent to the mouthpiece 2, being provided with a recess, as clearly shown. Secured to saidhead 5 is the "diaphragm 6,-which has soldered or otherwise secured .to it at its central. point aconductor' 7, consisting of a metallic core, which extends through the core 3 and communicates with the line-wire'8 through a connecting-wire 9. 0 The end of the conductor 7 opposite the dia;

phragm 6 is attached to an adjustment-nut 10, which bears against an insulatiugmash'er" 11, abutting against'th'e rear side of the head 4. .By means of said adj us'tment-nut the conductor 7 may be drawn outwardly or forced inwardly for the purpose of increasing or diminishing the tension upon the diaphragm 6. .The battery 12 one poleground'ed. To

E. Evans, of

greater degree of clearness and dist-inctness.

Patent, is

Serial R0. 638,401. (No model.)

I the other is attached a wire 13, connected-to I a helix 14,'wound upon the core 3, the said 5. helix having the windings thereof insulated from each other and from the core. The saidhelix is connected at its opposite end through a wire 15 to a projecting portion 16 of the diaphragm 6.

The circuit through the transmitter is as follows: Battery 12, wire.13, helix 14, wire -15, diaphragm 6, conductor 7, connectingwire 9, and line-wire 8. In action vibration of the diaphragm is caused by the soundwaves projectedagainst it through the mouthpiece 2. This causes a longitudinal vibration of the conductor 7 within the magnetic field of-force of the core 3 and the lines of the magnetic fields of both the conductor? and core 3 are cut. The magnet formed by the core 3 is thereforeafiected, as well'as the current through the helix 14 around said core. This intensifies the action'o'f the circuit and transmits the vibrations to the -re- 7e ceiver at the opposite end of the line in a clearer and more distinct manner.

Having now described the invention, what I claim as new, and desire to secure by Letters 1 1. In a' magneto-telephone, a hollow core,

a metallic diaphragm secured opposite one of the headsthereof, a metallic bar-constituting a conductor secured at one end to' said dia phragm and. adj ustably secured at its other end to a stationary part, whereby the tension of said diaphragm may be positively controlled, a helix upon said core in electrical connectioiifvgith a battery or generator and said diaphragm,and connections between said conductor and the line-wire.

2. In a magnetortelephone, a hollow core having heads formed upon thebpposite ends thereof, one of which is provided. with a'recessin its outer surface, a metallic diaphragm secured to the recessed headhavingaprojecting portion thereonwhich extends beyond the p'eripherygof said head,ja metallic bar constituting a conductor .at-one end to said diaphragm and adjustably secured at itsfother end to the head of said core oppo-- site said diaphragm, a, battery, a line-wire, In testimony whereof I have signed this a helix upon said core having one end in elecspecification in the presence of two subscribtrical connection with said battery, and elecing witnesses.

trical connections between theother end of WILL E. BYRNS.

5 said helix and the projection on said dia- \Vitnesses:

phragm and between said conductor and the J. W. PARKER,

line-wire. MOSES R. TURNER. 

